It lacks the je ne se quois of a binary planet. It just doesn’t have the right atmosphere for it, you know.
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Zuriz@sh.itjust.works 4 weeks ago
The Moon beign classified as a Moon despite qualifying as a binary planet. :(
captainlezbian@lemmy.world 4 weeks ago
mnemonicmonkeys@sh.itjust.works 4 weeks ago
The barycenter between the Earth and Luna is well within the surface of the Earth. There is no definition where it counts as a binary system
ContriteErudite@lemmy.world 4 weeks ago
The Earth/Moon system does not qualify as a binary planet because it does not meet the L4/L5 instability threshold. In a system of two orbiting masses, the larger needs to have at least 25x the mass of the smaller for the system to have stable L4/L5 points. Earth is ~80x more massive than the Moon, allowing the system to have stable L4/L5 points, and is therefore a satellite system.
tetris11@feddit.uk 4 weeks ago
Quick diagram for anyone wondering
Image